Method using photographic density value to measure homogeneous material thickness
A technology of material thickness and blackness, applied in measuring devices, using wave/particle radiation, instruments, etc., can solve the problems of high price and large amount of invested capital, saving purchase costs, strong applicability, and improving detection quality. Effect
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[0044] Take a large aluminum alloy precision casting in the shape of a truncated cone as an example, hereinafter referred to as aluminum castings such as Figure 4 shown;
[0045] In the first step, the thickness of the aluminum casting is estimated to be 12-17mm;
[0046] The second step is to select a standard ladder test block made of aluminum, such as figure 1 As shown, there are 10 steps, and their heights from high to low are 30mm, 27mm, 23mm, 21mm, 18mm, 16mm, 14mm, 12mm, 10mm, 8mm;
[0047] The third step is to select the X-ray radiographic parameters for the aluminum material standard ladder test block as follows:
[0048] Transillumination tube voltage 70Kev, tube current 20mA, exposure time 1Min, focal length 1000mm; film system: film AgFa D7, developer and fixer are "Tianhai set medicine", developing time 3Min, fixing time 5Min, developing temperature 28℃;
[0049] The fourth step is to arrange the radiographic film, and use the parameters of the third step to p...
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